allen



2 Sheets-Sheet 1.

` (No Model.)

C. PQ ALLEN.

' CUT-OFF.

Patented Feb. 6, 1883.

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(No Model.) 2 sheets-snaai@ C. P. ALLEN.

GUT-OPF. N0. 271,761'. .Patented'Febl 6,1883.

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UNITED STATES PATENT4 EEICE.

CHARLES P. ALLEN, on DENVER, coLonADo.

cpu-r- SPECIFICATIONform'ng part of Letters Patent No. 271,761, dated February 6,

Apenas@ nieu August 11', 1882. (No model.)

To all whom it may concern:

Be it known that I, CHARLES P. ALLEN, a citizen ofthe United States of America, residing at Denver, in the county of Arapahoe and State ofOolorado, have invented certain new and useful Improvements in Gut-O's for City 'Water-Service; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference .being had to the accompanying drawings, and to letters each other.

or figures of reference marked thereon, which form a part of thisspecification, in which- Figure l is a vertical section of part ofa house and the roadway in frontot' it, showing The street-main, tire-plug, house service-pipes, and my cutoff' in their relative positions to Fig. 2 is a side elevation of a h ydrant with the cut-oft' attached to the spout.

`This figure also shows, by means of dotted signed for use with a system of Water-supply` in which the Water is pumped directly into the mains or into a `stand-pipe, and has for its objectthe automatic cutting oft'or closing, entirely orpartially, ofthe supply of water to buildings, Afountains, Suc., so that the supply can be concentrated upon the rep1ugs in caseof a tire, and all the water the system permits of be ldischarged at the required point, and when this service is completed opening the service to the buildings, fountains, Src.; and it consists in cutting o the whole or part of the ordinary service by increasing the pressure, andin the construction, arrangement, and operation of parts, as will be hereinafter more fully set forthand claimed. L

In order to enable others skilled in theart to which it appertains to make and use myinvention, I will proceed to describe its construction and operation.

oFF.

A is the outer shell, having inlets B and C and outlet D. If desired, the inlet C may he used as an outlet,when the cut-oft' is closed, or it may beplngged and not used at all.4

i An inner shell or body, E, incloses a chainber, F, which communicates directly with the outlet D, and by means of valves G and H with the inlet-chamber I. The valve His located `beneath and seated in the wall of the sheIlE,

opening downward. I

In the upper part of the shell E a cylinder, K, isset, the lower end of which is chamfered to make a seat for the valve G, which opens downward, and is connected to the valve H by a stem, L, which is provided with centering-guides M, that bear upon the sides of the lower` valve-seat. The stem L extends asuitable distance upward into the cylinder K, and at or near its upper end sustains a piston, N, that fits the cylinder K, and is secured to the stem by means of a cap, O, and sleeve P. The space between the piston and the valve G forms a chamber, Q, which has afree communication with the chamber 'I by means of any desired number ofopenings R through the side of the cylinder K.

'Ihe top ofthe cylinder K is provided with a cap, S, held down iuponits seat by a cylin-y der, T, screwed into the top ofthe cylinder K;

A coiled spring, U, is secured in any suitable manner to the cap S, and extends upwardany required distance, having a nut, V,secured to its upper end. A threaded rod, W, passes through this nut, the center of the coiled spring, and the center of the cap S, and rests upon the center of theend of the valve-'stem which extends up through the top of the piston. By adjusting the rod in the nut the spring can be made to exercise more or less pressure upon -the end of the valve-stem, so as to counteract any given degree ot' upward pressure upon the top of the valve G, owing to their excess of area.

An opening, X, admits air into the cylinder T, and from .there it may pass into the charnber, between the cap S and piston N, through p the open center of the cap S.

Where there is objection to shutting off the IOS the chamber F, tappingin its course the chamher I, making a small opening. A screwthreadedplug, a, provided with a groove, b, extending a suitable distanceirom the inner end, is inserted and so adjusted that the groove b will form an open channel between the two chambers, as shown in Fig. 6 ofthe accompanying drawings. v A half-turn of the screw will close this channel when desired. The spring II being set to resist a pressure in the watermain ot', say, thirty-five pounds to the inch, and an alarm of re conveyed to the pumpinglstation, the pressure is at once increased to,

say, seventy-tivepounds to the inch. This over- 4 off' and stop the iow ot' water.

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. In a system of water-supply, a cut-o" locatedbetween the main and service pipes, and provided with means for keeping said cut-ott' open under a normal pressureint-he mains, and for automatically closing it by an increased pressure in the same, and keeping said valve closed until the pressure is reduced to its'normal condition, whereby the supply of water can be concentrated at any desired point, substantially as shown and described.

2. A cut-ofi for a water-service in which the pressure can be increased or diminished, consisting of chambers and valves, in combination with an adjustable rod and spring, whereby the degree of pressure at which the stoppage shall take place and be continued can be regulated, substantially as and for the purpose shown and described.

3. A cut-oli' fora water-service in whichl the samer pressure can be increased or diminished, consisting of chambers and valves, in combination with an adjustable rod and spring, whereby the degree of v pressure at which the stoppage shall take place and be continued can be regulated, and a connection between said chambers, whereby a lmitedsupply ofwater can be con.- tinued after the greater portion has been cut off, substantially as shown and described,

4. A cut-ofil for a water-service in which the pressure of the water can be increased or diminished, consisting of the shells AE, forming the chambers I and F, valves H and G, stem L, and piston P, in combination with the cylinders Tand K,the latter having openings R, adjustable rod W, and spring U, substantially as shown and described, whereby the degree of pressure at which the stoppage shall take place and be continued can be regulated.

5. A cnt-oft' fora water-service, consisting of the shells AVE, forming the chambers I and F, valves H and G, stem L, piston P,cylinders T and K, the latter having openings R, adjustable rod and springy U, in combination with the slotted plug a, forming a cha-nnel between the chambers'I and F, substantially as' shown and described, whereby a limited supply of water can be continued after the greater portion ofthe supply has been cut oft'.

6. The combination ofthe slotted plug a with the shells A and E, substantially' as shown and described, whereby a channel connecting the chambers I and F is established.

7. The combination of the shell E, valves H G, stem L, piston N, cylinder K, provided with openings It, and the shell A and inlet B, substantially as shown and described.

8. The combination/ot' the' cylinders T and K, cap S, nut V, spring-U,vand rod W with the valve-stem, valves, and shells, as shown and described.

In ltestimony whereofI afiix my signature in presence ot' two witnesses.

- v CHARLES P. ALLEN. Witnesses:

RICHARD HOLME', RtoHARD HoLME, Jr. 

